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Solange Knowles was “crazy drunk and out of it” when she launched her attack on Jay Z and has been struggling with family and career issues after being dropped by Jay’s label, sources claim.

Solange was seen on video attempting to punch and kick the rapper, who did not retaliate, while her sister Beyoncé weakly looked on, as they left a Met Ball after-party at The Standard hotel in the Meatpacking District on May 5.

Sources tell us that Solange had worked hard to keep her music career afloat after she left Roc Nation last year and started her own label, Saint Records.

One source said, “Clearly she was on something at the party, she was drunk and out of it. The girl is crazy and prone to outbursts. She got in the elevator with Jay and Bey. He had made a comment that she didn’t like, and she just snapped.”

Another who witnessed her bizarre behavior said, “She was the girl who drank too much and was behaving badly at the party.”

An insider added that Solange has recently gone through a lot of turmoil: “She used to be on [Jay Z’s] label [Roc Nation], but now she isn’t. And she moved to New Orleans from Brooklyn with her son. Solange still spends a lot of time in New York, but she is further away from her family, which has created some issues.”

Jay Z and Beyoncé sit courtside for the Miami Heat’s 102-96 victory over the Brooklyn Nets at the Barclays Center on May 12.Photo: Anthony J. Causi

Meanwhile, bosses at The Standard were desperately trying to track down who leaked the surveillance tape to TMZ for up to $250,000.

“This was being shopped for five days to the highest bidder,” said a source who confirmed the tape was sold for $250,000. The Standard has hired Hollywood lawyer Marty Singer, who is investigating who shopped the tape. “There are only a handful of people who’d have access to that tape,” our source said. “The Standard owns that tape.” But, “Once it was out, Jay Z’s people felt they couldn’t control it. They were reluctant to try and publicly fight this.”